One55 Series windows and doors equipped with Thermal Evolution technology feature a fiber-reinforced polymer (FRP) isolator that is precision-machined to nest perfectly within the hot-rolled solid steel frame profiles. This thermally resistant FRP isolator is structurally bonded to the window and door frames to create a strong and enduring composite construction that delivers thermal efficiency and enhanced resistance to condensation. The framing profiles remain intact for the full depth of the window profile, making them stronger than traditional thermally broken window and door systems.